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(No Model.)

W. B. MARTINDALE 8?; E. R. MALMBORG.

CALENDAR CLOCK.

Patented Apr. 12,1892.

WITNESSES.-

GH'wUv YKWMWOK BY agwmdu mm ATTORNEY.

UNITED STATES PATENT OFFICE.

WVARREN B. MARTINDALE, OF KENOSI'IA, \VISCON SIN, AND ERNST R. MALM-BORG, OF ST. LOUIS, MISSOURI, ASSIGNORS, BY MESNE ASSIGNMENTS, TO THENEIV YORK ELECTRICAL DEVICE COMPANY, OF VIRGINIA.

CALENDAR-CLOCK.

SPECIFICATION forming part of Letters Patent No. 472,952, dated April12, 1892.

Application filed December 30, 1889. Renewed October 14, 1891. SerialNo. 408.654. (N model.)

To all whom it may concern.-

Be it known that we, XVARREN B. MARTIN- DALE, of Kenosha, in the countyof Kenosha and State of Wisconsin, and ERNST R. MALM- BORG, of the cityof St. Louis, in the State of Missouri, have invented certain new andusef ullmprovements in Calendar-Clocks; and we do hereby declare thatthe following is a full and exact description thereof, reference be- IOing had to the accompanying drawings, and to the letters of referencemarked thereon, ma'kinga part of this specification.

This invention relates to an improvement in calendar-clocks, and has forits object to provide at low cost in a neat simple form a time-calendarwhich will indicate and clearly expose to view in proper order and inthe same right line the year, the month, the day of the month, and thetime of day.

It consists in the novel combination and arrangement of devices,substantially as hereinafter described and claimed, for actuating aseries of date and time indicating wheels, all mounted to revolveindependently and in proper order upon the same horizontal axis.

In the accompanying drawingsfFigui-e 1 is a vertical section in line y 3of Fig. 2, repre senting a side elevation of the time mechanism andindicating-wheels with the casing, excepting a portion of the frontplate, broken away. Fig. 2 is an irregular section in line :0 0c of Fig.1 with a portion of the time mechanism omitted; Fig. 3, a detached viewof one end of the indicating-wheels in same section as Fig. 1,illustrating the movement of the mechanism operating the same. Fig. 4 isa detached View similar to Fig. 3, illustrating a modification of theinvention, in which endless bands are substituted for theindicatingwheels; and Fig. 5, a front view of said bands.

Similar letters indicate like parts in all the figures.

A represents the front plate of a case of any suitable form and designto inclose the improved mechanism; 13 B B, a series of sightopeningspierced in a straight horizontal line through said front plate.

C D E F G H are the date and time indicating wheels for the calendar,all of which are mounted to revolve freely and independently on ahorizontal shaft I, fixed in the case parallel with its front plate andin position to permit the characters 011 the periphery of each wheel tobe read through one of the sight-openings B. The outer wheel C at theleft in the series (see Fig. 2) bears upon its periphery the names ofthe months and the outer wheel II at the right bears upon its pe ripherya corresponding series of figures indicating a succession of years.These two wheels are adapted to be turned by hand for adjustment, asrequired. Of the intermediate wheels the date-wheel D, next to the rightof the month-wheel C. is formed in two divisions a and Z), revolvingindependently closely side by side, the first a being divided into tenperipheral spaces bearing thereon the nine digits and acipher, and thesecond 1) into twelve peripheral spaces bearing the numbers l 2 3repeated in three series with blank spaces between each series. Thefirst division a carries at its right, to revolve with it, first, a disk0, having a single peripheral notch, and, second, a ratchet-wheel d, oflike diameter, having ten teeth, and the division 1) carries upon itsleft to revolve with it, a ratchet (2, having twelve teeth.Theperipheryot the meridian-wheel e, mounted next to the right, isdivided into twelve peripheral spaces,bearing 8o thereon the letters A.M. and P. M. alternately, and said wheel carries on its left, to revolvewith it, first a ratchet f, having twelve teeth, and next a disk g, oflike diameter, having siX peripheral notches. The hour- 8 5 wheel F nextto the right is divided peripherally into twelve spaces, bearing,respectively, the numbers 1 to 12, each followed by a dash, and itcarries upon its hub to the left a ratchet-wheel h, having twelve teeth,and a 0 disk 1', of same diameter, having a single peripheral notch.Lastly, the minute-wheel G, between the hour-wheel F and year-wheel H,is formed in two divisions m n, revolving independently closely side byside, like the date- 5 wheel D. The first division m on the rightcarries upon its periphery in ten equal spaces the nine digits and acipher, and the second division 71 is divided peripherally into twelvespaces bearing, respectively, the figures 1 to 5 and a cipher repeatedin two series. The first or units division m carries upon itshub, torevolve with it on the right, first, adisk Zc,having a single peripheralnotch, and, second, a ratchet-wheel Z, of the same diameter, having tenteeth, while the second or tens division n carries upon its hub, torevolve with it on the left, first a ratchet-wheel 19, having twelveteeth, and nextadiskr, of the same diameter, having two peripheralnotches.

The disks and ratchets carried by the indicating or calendar wheels allcorrespond in diameter.

The ratchets of the wheels E, F, and Gare severally engaged each by onearm of a bifurcated pawl K, whose other arm rests upon the periphery ofthe disk revolving with the next wheel to the right, so that each pawlis the arm thereof, resting upon a disk, dro'ps into a peripheral notchon said disk. Single pawls LL are in constant engagement, the one withthe ratchet Z of the first orunits division m of the minute-wheel G andthe other L with the disk 9 of the meridian-wheel, said second pawlbeing made to overlap, also, and

engage, as permitted, the ratchet d of the first division of thedate-wheel. These single pawls, together with the several bifurcatedpawls K K, are all pivoted upon a transverse rod M, extending parallelwith the axis of the indicating-wheels at the rear thereof. The ends ofthis rod M are pivoted between ears or lugs N N, projecting from aparallel bar 0, which is carried upon the lower ends of two verticallevers P P, pivoted at t to brackets Q Q, projecting from the frame-workR, in which the time mechanism is mounted. Hence the oscillation ofthese levers, by causing the rod M to swing back and forth to and fromthe indicating-wheels, will cause the pawls to reciprocate in manner toactuate said wheels. The rod M and the pawls pivoted thereto are thusoscillated once eachminute by means of a crown ratchet-wheel S, havingsixty teeth, against which a counterpart tooth on the upper arm of eachlever -P is held by means of a suitable spring T. This crownratchet-wheel S revolves once in every K, actuating the time-indicatingcalendarwheels. The pawl L, being in constant engagement with ratchet Zof the units-division m of the minute-wheel G, will cause it to move onestep each minute and at the tenth minute the single notch in theperiphery of the disk 70, revolving with said ratchet, will permit thebifurcated pawl K of the second or tens division at of the minute-wheelG to drop into engagement with its ratchet, whereby it will be moved onestep at the next movement of the pawls, so as to bring the appropriatetens figure for the second place in the minutes into sight. In likemanner, when the tens minutewheel n has made a revolution, the notch onthe periphery of the disk a", revolving therewith, will be brought intoposition to allow the bifurcated pawl for the hour-wheel F to engage theratchet on said wheel and move it one step, and thereby indicate thechange in the hour, and by similar means, as described, themeridian-wheel E will be moved one step each twelve hours and thedate-wheel D once every twenty-four hours.

To avoid complication in the mechanism, the date-wheel may be adjustedby hand on the first day of each-month.

As a modification of our calendar, an endless band W, ofsufficient'length to admit of a bearing clearly upon its surface thesixty numbers indicating the minutes. may be carried over a wheel 1%(see Fig. 4) to be actuated by means of the reciprocating movement ofthe pawl L, engaging the ratchet-wheel Z, secured laterally to saidwheel m, the upper end of the band being carried over a one over theother, as is illustrated in Fig. 4, in which said lugs are shown at'themoment they are about to separate, the pawl 1; having been pushedforward to the extreme length of its stroke. The pawl is retractedautomatically by the stress of a spring S, attached to the pawl-lever U.y

We claim as our invention The combination, in a calendar-clock, of atime-train, a contrate ratchet-wheel upon its hour-spindle, a pivotedlever having a beveled tooth on one arm engaging the inclined teeth ofthe ratchet, a spring enforcing said engagement, a pawl pivotallyconnected to the opposite end of said lever to reciprocate with it, anda date and time indicating device actuated by said reciprocating pawl,substanti ally in the manner and for the purposeherein set forth.

In testimony whereof we have'hereto signed our names in the presence oftwo witnesses.

WARREN B. MARTINDALE. ERNSTv R. MALMBORG.

Witnesses:

0. O. LOGAN, B. F. GRAY, Jr.

the wheel as the two lugs are made. to slide

